Electric resistance furnace



May 29, 1923.

G. M. UTTLE ELECTRIC RESISTANCE FURNACE Filed Feb. 26 1921 mt Mao 66055742 M. Liff/fi ct the crucible 14;.

21. ,Plugs'22 are the openings 18,

' simple means for the path traversed by the current, to a pre- Similar openings. 20 are provided'in the bottom plate 5 to permit of Withdrawing the oxidized material from the bottom of the Lifting members 24 may be provided in the top plate 3 to permit of'lifting the con t'ainer 1 by purposes of pouring the'melted metal out It may be noted that the device embodying my invention provides a granular resistorhaving a relatively large area of (1)11 tact engaging the/supply circuit terminals, thus insuring that the material in this part of the electrical circuit will not be consumed by arcing which frequently occurs between the grains of a' granular resistor when the sameis not tightly packed.

My invention further provides relatively restricting the area of determined portion-relatively to the crucible.

lily 'inventionfurther provides relatively simple means foreffecting' initial andsubsequent compression of the granular resistor and for permitting the Withdrawal and the insertion of granular material while the furnace is in operation. I

Various modifications may be made in the device embodying my invention without do parting fromthe spirit and scope. thereof, and I desire that only such limitations shall befplaced thereon as are;imposed by the prior art or arespecitically set forth in the appended claims.

and relatively long plugs resistor matemeans of a lifting chain 25' for aces-so lclaim as my invention:

1. An electric furnace comprising a metal container, a metalcover for said container, a metal base plate secured'to and insulated from said container, means for attaching electricsupply-circuit terminals to said container, granular resistor material surroundmg said CTUCll'J'lQlllld means in. said cover .tor compressing said resistor material insaid containen, I

An electric-resistance furnace comprising a metal base plate, a closed metal con.-

tainei: secured to and insulated from said base plate, contact terminals secured to said base plate and said container, respectively, a crucible in said container, a mass of granular resiidaance material located. in said container, means comprising a Wall of refractory insulating material surrounding said crucible, but out of contact therewith, for. reducing the amountot material adpcent tos'aid'crucible, means in said base plate for permittingthe withdrawal of said granular resistance material, and means in the top of said container for permitting the introduc' tion of additional resistance material While the furnace is infloperationh' 3. An electric resistancefurnace comprising'a metal base plate, a closed metal container secured to and insulated from said base plate, contact terminals secured to said base plate and said container, respectively, a crucible in said container, granular resistor material surrounding said crucible,

and means in said container for permitting the introduction of granular resistor materialinto said container and for compressing the same therein, during the operation o1 the furnace.

In testimony u'liereof, subscribed my name this *v 1921. m non nirrnn silo 7 l have hereunto 10th day 01" Felo- 

